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      Question

      In networking, what is the purpose of a subnet

      mask?
      A To encrypt network traffic Correct Answer Incorrect Answer
      B To block unauthorized network access by stopping all incoming traffic from a network ID Correct Answer Incorrect Answer
      C To assign dynamic IP addresses to devices Correct Answer Incorrect Answer
      D To identify which portion of an IP address is the network ID and which is the host ID Correct Answer Incorrect Answer
      E To translate domain names to IP addresses Correct Answer Incorrect Answer

      Solution

      A subnet mask (e.g., 255.255.255.0) divides an IP address into the network portion and host portion using bitwise AND operations. This enables subnetting — dividing a large network into smaller segments for efficient routing and security.

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